Weigel vs Breitbart

“Let’s not drain the blood from what happened here,” Mr. Weigel said.
“Somebody hacked into off-the-record e-mails, many of them from before I
went to work at The Post, and picked the ones that made me look the
worst. It was a kind of opposition research, and just about anybody that
happens to is going to end up looking bad.”

That leaker who destroyed Weigel’s career had agreed to the off-the-record nature of the 400-strong list; the minute the leaker went public with the material the story was no longer about Weigel but about the JournoList itself.

This seems to me to be an important distinction. Was Journo-List hacked or betrayed? And will anyone tell?